Do coffee travelers keep coffee hot?

Not really, they just make it easier to hold a hot cup

It's not like a thermal cup, but the coffee stays hot for a few hours at least.

EDIT: Hm, what exactly do you mean by traveler? I assumed you were asking about the Starbucks Traveler which is about a gallon of brewed coffee in a cardboard container with a spout.

No the actually make it colder. The only people who buy them are people who want iced coffee